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Commit f59de899 authored by Tejun Heo's avatar Tejun Heo Committed by Ingo Molnar
Browse files

lockdep: Clear whole lockdep_map on initialization 

lockdep_init_map() only initializes parts of lockdep_map and triggers
kmemcheck warning when it is copied as a whole.  There isn't anything
to be gained by clearing selectively.  memset() the whole structure
and remove loop for ->class_cache[] clearing.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=35532



Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Reported-and-tested-by: default avatarChristian Casteyde <casteyde.christian@free.fr>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=35532


Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110714131909.GJ3455@htj.dyndns.org


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 83835b3d

kernel/lockdep.c

+1 −4
Original line number Diff line number Diff line
@@ -2874,10 +2874,7 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this, 
void lockdep_init_map(struct lockdep_map *lock, const char *name,

		      struct lock_class_key *key, int subclass)

{

	int i;



	for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)

		lock->class_cache[i] = NULL;

	memset(lock, 0, sizeof(*lock));



#ifdef CONFIG_LOCK_STAT

	lock->cpu = raw_smp_processor_id();